Select 2RS for a sealed bearing , has two contact rubber seals one on each side of the ball bearing.
If your application requires a 6003 ball bearing with only one seal you can get this ball bearing and take one of the seals off. can take electric motor demands if needed.
Used widely in industrial machine, motorcycle, automobile, power tools and mechanical equipment and other kinds of field
Product Name : Sealed Ball Bearing
Model : 6003-2RS
Material : Metal
Color : Silver Tone, Black
Internal Diameter : 17mm/0.67"
Outside Diameter : 35mm/1.38"
Width : 10mm/0.28"
Package Content : 1 x Sealed Ball Bearing
Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.